RU1830638C - Device for testing and adjusting of television set units - Google Patents

Description

the first and second inputs of the comparator of the controlled parameter, and the third and fourth outputs, respectively, with the first and second inputs of the gated comparator 5. The first output of the driver 11 of the reference voltage is connected to the third input, and the second output to the fourth input of the comparator 3 of the controlled parameter. The third and fourth inputs of the gated comparator 5 are connected respectively to the third and fourth outputs of the reference voltage generator 11, the fifth output of which is connected to the first input of the amplitude comparator 12, and the sixth to the first input of the duration comparator 13. The fifth output of the input switch 1 is connected to the second inputs of the comparators of amplitude 12 and duration 13, and their outputs are connected respectively to the first and second inputs of the third element And 9. The output of the gated comparator 5 is connected to the second inputs of the first 7 and second 8 elements I. The output of the comparator -3 of the monitored parameter is connected to the first input of the shaper 15 of the indication signals. The outputs of the first 7, second 8 and third 9 elements And are connected respectively to the first inputs of the second 16, third 17 and fourth 18 of the shapers of the signal indications. The control input of the input comparator 1 is connected to the first output of the control unit 14, the control inputs of which are connected respectively to the buses of the same name, and its second output is connected to the second inputs of the display drivers 15 ... 18, the outputs of which are connected to the corresponding inputs of the indicator 4. From the seventh to eleventh outputs of the shaper 11, the reference voltages are connected to the corresponding inputs of the input switch 1. Connectors (not shown) are connected to the inputs of the switch 1 to connect to the corresponding connectors ep emogo block.

The device operates as follows. The input switch 1 (see Fig. 2) connects the equivalent loads from block 2, comparators 3, 5, 12, 13 via buses 25 ... 29, either to the corresponding buses of the tested block (not shown), or support voltages (possibly located in the tolerance field) along buses 31 ... 35 from the shaper of the reference voltages 11, depending on two modes. The operation of the device is measurement of parameters and monitoring of readiness of the measurement channel. Accordingly, the operation mode is set at the control input 30 of the switch 1c of the output 60 of the control unit 14 (see

figure 4). Block 2 load equivalents simulates the loads connected to the tested block during its operation in real conditions. The generator 11 reference voltages (see Fig. 3) generates reference voltages at outputs 52 ... 57 corresponding to the tolerance for the output voltages of the tested unit and at outputs 48 ... 51 control voltages lying within the field limits tolerances, as well as at the output of 47 pulses in amplitude and duration corresponding to the norm. Comparison of voltages either coming from the unit under test or voltages lying in the field

Reference tolerance 5 is implemented in the comparator 3 of the parameter to be monitored. There may be several comparators 3, according to the number of monitored parameters. For some voltages in circuits

0 of the tested unit, it is important that their value is not less than a certain threshold, to control these voltages, a gated comparator 5 is introduced into the device. The gated comparator 5 is doubled and one of its halves and one of the AND 7 or 8 elements work in each half-period of gating The gating is carried out here so as not to overload both halves of the gated comparator 5, to ensure their alternating operation and to maintain high control accuracy. Generator 6 generates a meander supplied to the gating inputs of comparator 5, moreover, to one directly, and to

5 through the element NOT 10. These same pulses are fed to the inputs of the first 7 and second 8 elements I. Thus, two voltages are monitored alternately using the comparator 5. Pulse control 0 s. generated by the test block, is carried out in terms of amplitude and duration with the help of comparators of the amplitude and duration of pulses 12 and 13, respectively.

5 The signal at the output of 1/1 9 appears when two parameters are normal. Similarly, signals when parameters match the norm appear. , with the outputs of the comparator 3, AND elements

0 7, 8 and are fed to the first inputs of the formers 15 of the indication signals (see FIG. 5), which generate the signals displayed by the indicator 4. In the parameter measurement mode, the control voltage

5, the input 63 is supplied to the input of the key 59 and the second output 61 of the control unit 14 receives a bus signal to the second inputs 69 of the drivers 1.5, the key 65 is opened, connecting the timing circuit of the generator 64 to the common bus, and two types of signal can be generated, depending on the information received at the first inputs of 68 shapers 15. If the parameters of the tested block are normal from the output of the comparator 3, elements 7, 8, 9, the first inputs of the shapers 15 receive a signal that is inverted by the HE 67 element and closes the key 66, breaks The power supply circuit of the generator 64 is on, and the indicator 4 is off. If the parameters of the block under test comply with the norm at the output of the comparator 3, elements And 7, 8, 9, a zero potential is established, the key 66 opens with an intermittent light on the indicator 4,

In the monitoring mode of readiness of the measurement channel, the key 59 is closed, the signal from the output 61 of block 14. is absent on the bus 69, the key 65 is closed, the timing circuit of the generator 64 is open, which eliminates the occurrence of self-oscillations. The control voltage from input 62 is supplied to the control input of key 58. Key 58 is open. From the output 60 of unit 14, a signal is supplied to the control input 30 of the switch, providing a supply to the measuring inputs of the comparators 3, 5, 12. 13 control voltages lying in the tolerance fields of the comparators. Depending on the information coming from the output of the comparators 3, 5, 12, 13 through the elements And 7, 8, 9 to the first inputs of the formers 15, two types of signal can also be generated (constant illumination or no glow), reflecting the state of the measuring path , the passage of the signal along the entire measuring path, the compliance of tolerance fields with the comparators 3, 5, 12, 13, or the failure to fulfill these requirements. In accordance with the norm of the channels for measuring parameters from the outputs of the comparator 3 ,. elements AND 1, 8; 9, a signal is applied to the inputs of the driver 15, which is inverted by the element HE 67. closes the key 66 and the indicator 4 does not light. In the event of a deviation of any channel of parameter measurement at the outputs of the comparators 3, 5. 12, 1.3, the zero potential is established, the key 66 opens, turning on the power circuit of the equivalent of the single-junction transistor of the generator 64, which, when in the open state, illuminates corresponding indicator element 4.

Thus, while maintaining the high operational capabilities of the prototype, the device has increased reliability of control by providing constant monitoring of the readiness of measurement channels for pa6ofe.

Claims (1)

SUMMARY OF THE INVENTION A device for monitoring and tuning television receiver units, comprising an input switch, the first and second outputs of which are connected to the corresponding inputs of the equivalent load unit, a comparator of a controlled parameter, four inputs of which are connected respectively to the first and third inputs 0 switch and the first and second outputs of the reference voltage driver, the third and fourth outputs of which are connected to the first and second inputs of the strobe virus comparator, the third and fourth inputs of which are connected respectively to the second and fourth outputs of the second comparator, the output of which is connected to the first inputs of the amplitude comparator pulses and a comparator of pulse durations, the second inputs of which are connected respectively to the fifth and sixth outputs of the shaper of the reference voltages, as well as three episodes I, ele ent NOT generator, wherein the first input of the first AND element is connected to 5 by the first input of the second AND element and with the first input of the gated comparator, the fifth input of which is connected to the second input of the second AND element and the output of the element NOT, the input of which is connected to the sixth 0 input gated comparator, the second input of the first element And and the output of the generator of the strobe pulses, the two inputs of the third, element And are connected respectively to the outputs of the comparators amp5. litudes and pulse durations, about the same. that, in order to increase the reliability of the control, four shapers of indication signals and a shaper of control are introduced. 0 signals, the first output of which is connected to the first input of the input switch, the second, third, fourth, fifth and sixth inputs of which are connected to the seventh, eighth, ninth, tenth and eleventh outputs of the reference voltage driver, the second output of the control driver the signal is connected to the first inputs of four shapers of indication signals, the outputs of which are connected to four inputs of indicators, while the second input of the first shaper of indication signals is connected to the output of the comparator controlled by pairs etra, the second input of the second signal driver 5 is connected to the output of the first element And, the second input of the third driver of signal indications is connected to the output of the third element And, and the output of the fourth driver of signals of indication is connected to the output of the third element I. Checked Outputs To isierz / g elngn oxoda / h e co / clarotsueob , uh, Control e.g. Riga Ј UprBlUTs and approach Walking Walk / t Riga 4 input 2 input Editor S. Kulakova Compiled by V. Anodin Tehred M. Morgenthal tf | P0 "M M. M." J # FIG. 5 Proofreader L. Pilipenko